The story in Ninku is about an odd-looking 12-year-old boy named Fuusuke who is a powerful warrior from the Ninku school of martial arts, a style that mixes ninjutsu and karate.

It is explained that before the present time in the story that those who could use Ninku were targeted by an evil empire and the Ninku corps were formed to combat the menace. The names of the corps were taken from the twelve Chinese zodiac animals and each captain of the corps was called the zodiac animal Ninku master. When the war was over, the Ninku were defeated and almost all of them were killed (except for a few corps' captains) since they were useless and were also dangerous for the rulers. At the beginning of the story, three years later, Fuusuke, the young former captain of the 1st Ninku corps and controller of the wind and Hiroyuki, his flatulent penguin, start searching for the other Ninku captains, each of whom can control various elements. However, a new group of Ninku users has arisen and are trying to take over the world. Fuusuke and his penguin must defeat the new Ninku empire with the help of his old comrades.

Source: Wikipedia

In this manga, the ultimate middle-aged hunter travels to another world. This time, he wants to live a slow and peaceful life.

She is the greatest and the last cultivator of the twenty-fourth century, however due to a certain mishap, she crossed into another world, into another body which has families oppressing her, a scumbag fiance abusing and steping over her…… Trying to take advantage of her now? Keke! Knocking on death’s door! Those who follow her will prosper, and those that oppose shall die! Behold as she pays back those who attempts to climb over her several folds!

Raising a hundred heroes and ending the war with an evil god, Eisen is the prophet that saved the world. Having received a great injury from protecting the heroes, he left for the Other World to recover. In that time, the heroes made use of their abilities to contribute greatly to the development of the world. Longing to meet again with the master they admired, they reported to him of their achievements in detail. Reading their letters, Eisen makes a decision to set out and pay each of them a visit as he travels the country to sightsee.

He can’t even kill a person, but he’s a villain? What kind of Villain is that? Kim Dong Jin, a high school student who calls himself a villain and explores the dark side. And this villain’s fatal weakness is…

An unimaginable talent without rivalry. Will it prove itself to be a blessing or a curse?

[Summary by OSTNT] It has been a year since Li Fu Chen lost his “Talent”. Now he lives the life of a trash, being bullied and beaten by those who once was inferior to him. However, he still has not lost everything as he’s still engaged to a strong and pretty girl of a powerful family, but that came to an end as the engagement was abruptly cancelled. With shame brought to the family and his life engulfed by darkness, a ray of hope pierced the the sky.

A couple of decades have passed since Ultraman last was seen in Tokyo, and his kaiju nemeses seem to have gone back into outer space. Former Ultraman Shin Hayata has forgotten that he ever wore the metal suit, though as Minister of Defense he still takes a keen interest in protecting Japan. His young son Shinjiro knows that his dad once worked with the SSSP (Science Special Search Party), but not that that explains how he came to have amazing strength and other seemingly supernatural abilities; as a moody teen he just thinks they make him weird. But then one day a dangerous alien comes back to Earth, and everything starts to become clear. Will Shinjiro don the suit and become the new Ultraman?

Satoshi Osako was a player of the VRRPG 『Sword and Sorcery』 who defeated the Evil God and died for his troubles. When he awoke again he found himself in a strange unknown forest. Furthermore he possessed his avatar’s body and abilities. In other words, he was a cheat. Can a 40 year old DT, live peacefully in this world?

Let his isekai adventure begin.

All of a sudden, out of nowhere.
“Renya Kunugi, you have passed away!”
So said the young girl who styled herself God.
Apparently, Renya Kunugi the Protagonist had lived long and prospered. His life already came to a peaceful and fulfilling end, but at the request of Her Holiness, he was transported to an alternate world to start a new life as a young man.
Thus did Renya, who was definitely your average everyday guy, end up fighting off bandits and vanquishing monsters. Eventually, after his successively blossoming talents coalesce into a force of sheer awesomeness, he will go on to leave his mark upon this alternate world.

This is an era full of aura, and a world where the immortals gather. The young Wu Fu returned from a reunion,and looking at his eyes, how calm he was. What I need to do is to raise the sword and clear all the enemies of the last

Due to a misuse of a word joke on live TV broadcast, girl group otaku, 'Jin-Kyung' ended up becoming doxxed and labeled as a "child predator", and ended up getting Social Anxiety Disorder. 3 years later, because of his past incident from the 3D world, his love for only the 2D world manifested, and ended up becoming a "Shut-In Otaku"! Then one day, as Jin-Kyung was no-lifing as usual, he was summoned to ‘Another World’, and came face-to-face with a bright-eyed, hopeful Summoner… Interesting enough, in the world that Jin-Kyung was summoned to, his Social Anxiety Disorder disappeared, and he was also able to wield immense power, and became the strongest summoned being there ever was!! The story of a former girl group otaku turned powerful 2D otaku, and the story of a weak and feeble Summoner commences now!!!

From: Easy Going Scans

In a world where only females are born with the ability to practice magic, Amel, a boy is born with the ability. In this world, he must conceal he is a male or he will be considered illegal. From the prestigious Espresso family, he/she must prove that only he/she is needed to capture the illicit escapees.

Elf? Dwarf? No! Humans are the strongest!

I was summoned to a different world where humans are the strongest living beings. In my previous world I was just a normal everyday salaryman, but in this new world, I seem to have become a rare existence.

I, who have obtained the strongest power through my race, have decided to enjoy this seemingly stress-free life to the fullest.

A young man set forth to avenge his master, a once powerful martial artist who was betrayed by his own men and barely escaped with his life. Armed with his master's supreme martial art techniques, he is ready to bring terror and wreak havoc among the murim. But before he even got started, he learns that the ones who had betrayed his master are already dead... Erm, so what happens now?

10 years ago, the monster horde from the rift formed from space and time started attacking the mankind. At the same time, people have started to awaken the power and began hunting the monsters for fame and money Lee SungHoon, in need of money because of his mother’s sickness, takes a dangerous job to help hunt those monsters four times a month by acting as a bait for the hunters But one day, he is heavily injured by a monster and remembers his past life as a sorcerer king ‘Huh? Did I just die?» ‘Wait, I was a Sorcerer King Kratraus in my previous life?’ With his past memories, SungHoon’s overpowered magic show begins.

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?

Having the capability to destroy humans, elementals, and gods, after a long period of countless wars and strife, Arnos the demon lord became sick and tired of all that and longed for a peaceful world, so he decided to reincarnate to the future.

However, what awaited him after his reincarnation is a world too used to peace that his descendants became too weak due to a huge weakening in magical powers.

Arnos enrolled in the Maou Academy established to find any students that might be the demon lord’s reincarnation, but his powers are too extraordinary that those in the academy couldn’t properly judge his powers, so he’s regarded as an “Inept student”. Being underestimated and avoided by most people there, he recruited a girl friendly to him, Misha, as his subordinate and comrade, and strives to climb to the top of the demon race hierarchy to one day reclaim his former title and status.

When Viscount Ascham’s House’s eldest daughter, Adele von Ascham, became 10 years old, she remembered everything with an intense headache.
Her previous self, Kurihara Misato, 18 years old Japanese, lost her life when trying to help a young girl, and then she met God. A somewhat capable person burdened by the many expectations of the surrounding people, Misato, who couldn’t live as she wanted, pleaded to God. “In the next life, please make my abilities average.”
Yet, somehow the story is wrong! The girl with 3 names, being careful to not accidentally become a S-rank hunter, lives normally.

Aaah, peaceful life is boring. After the battles of the first series, Joukyuu has to stay quiet in Japan teaching martial arts. Even with Veronica and Kageyasu close by, it is so sleepy. Then when a chef offers him a quick trip to US to mess with their gangs, in return for great Japanese food, he jumps at the chance. Dragging both girls with him, along with Bull for good measure, he arrives in America like a typhoon. Will they survive his entry?

Adu is no ordinary human being. He is actually one of the 12 most powerful Demon Kings who, after making a pact with an angel, has been allowed to materialize into a human's body in the real world under one condition:

He must seek and destroy all of the other Demon Kings.

Being one of the most powerful Demon Kings, this sounds like an easy task, but the aftereffect of becoming more human-like is becoming less demon-like. Becoming less powerful.

This is the story of Adu's journey as he embarks on a quest to rid the world of the Demon Kings and protect its people, all while hiding his dark secret from the very people themselves.